package com.xbniao.owms.utils.QRCode;

import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

import com.google.zxing.LuminanceSource;

/**
 * 类说明
 * @author wangbin
 */
public class BufferedImageLuminanceSource extends LuminanceSource{
	 private final BufferedImage image;
	 private final int left;
	 private final int top;
	 
	 public BufferedImageLuminanceSource(BufferedImage image) {
	    this(image, 0, 0, image.getWidth(), image.getHeight());
	 }

     public BufferedImageLuminanceSource(BufferedImage image, int left,
            int top, int width, int height) {
        super(width, height);

        int sourceWidth = image.getWidth();
        int sourceHeight = image.getHeight();
        if (left + width > sourceWidth || top + height > sourceHeight) {
            throw new IllegalArgumentException(
                    "Crop rectangle does not fit within image data.");
        }

        for (int y = top; y < top + height; y++) {
            for (int x = left; x < left + width; x++) {
                if ((image.getRGB(x, y) & 0xFF000000) == 0) {
                    image.setRGB(x, y, 0xFFFFFFFF); // = white
                }
            }
        }

        this.image = new BufferedImage(sourceWidth, sourceHeight,
                BufferedImage.TYPE_BYTE_GRAY);
        this.image.getGraphics().drawImage(image, 0, 0, null);
        this.left = left;
        this.top = top;
     }
     
     public byte[] getRow(int y, byte[] row) {
         if (y < 0 || y >= getHeight()) {
             throw new IllegalArgumentException(
                     "Requested row is outside the image: " + y);
         }
         int width = getWidth();
         if (row == null || row.length < width) {
             row = new byte[width];
         }
         image.getRaster().getDataElements(left, top + y, width, 1, row);
         return row;
     }
     
     public byte[] getMatrix() {
         int width = getWidth();
         int height = getHeight();
         int area = width * height;
         byte[] matrix = new byte[area];
         image.getRaster().getDataElements(left, top, width, height, matrix);
         return matrix;
     }

    
     public boolean isCropSupported() {
         return true;
     }

    
     public LuminanceSource crop(int left, int top, int width, int height) {
         return new BufferedImageLuminanceSource(image, this.left + left,
                 this.top + top, width, height);
     }

    
     public boolean isRotateSupported() {
         return true;
     }
     
     public LuminanceSource rotateCounterClockwise() {
         int sourceWidth = image.getWidth();
         int sourceHeight = image.getHeight();
         AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0,
                 0.0, 0.0, sourceWidth);
         BufferedImage rotatedImage = new BufferedImage(sourceHeight,
                 sourceWidth, BufferedImage.TYPE_BYTE_GRAY);
         Graphics2D g = rotatedImage.createGraphics();
         g.drawImage(image, transform, null);
         g.dispose();
         int width = getWidth();
         return new BufferedImageLuminanceSource(rotatedImage, top,
                 sourceWidth - (left + width), getHeight(), width);
     }
}
